Furuhata Chugakusei(2008)

古畑中学生 ～古畑任三郎生涯最初の事件～

Young Furuhata, a 3rd-year junior high student from Tokyo, transferred to a school in the countryside due to family circumstances. He doesn't fit in at first, but he eventually gains a reputation as a detective and opens his own detective agency. One day, he hears about the town's legend of buried treasure, and he immediately begins unraveling the mystery.